Problem: Baby Ehab was toying around with arrays. He has an array a of length n. He defines an array to be good if there's no way to partition it into 2 subsequences such that the sum of the elements in the first is equal to the sum of the elements in the second. Now he wants to remove the minimum number of elements in a so that it becomes a good array. Can you help him?

A sequence b is a subsequence of an array a if b can be obtained from a by deleting some (possibly zero or all) elements. A partitioning of an array is a way to divide it into 2 subsequences such that every element belongs to exactly one subsequence, so you must use all the elements, and you can't share any elements.

Input

The first line contains an integer n (2 ≤ n ≤ 100) — the length of the array a.

The second line contains n integers a_1, a_2, …, a_{n} (1 ≤ a_i ≤ 2000) — the elements of the array a.

Output

The first line should contain the minimum number of elements you need to remove.

The second line should contain the indices of the elements you're removing, separated by spaces.

We can show that an answer always exists. If there are multiple solutions, you can print any.

Examples

Input


4
6 3 9 12


Output


1
2

Input


2
1 2


Output


0

Note

In the first example, you can partition the array into [6,9] and [3,12], so you must remove at least 1 element. Removing 3 is sufficient.

In the second example, the array is already good, so you don't need to remove any elements.

Solution (in JAVA):

Solution:
/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Codechef
{   
	public static void main (String[] args) throws java.lang.Exception
	{  FastReader in = new FastReader(System.in);
        StringBuilder sb = new StringBuilder();
        int t=1;
       // t=in.nextInt();
        while(t>0){
            --t;
            int n = in.nextInt();
            int arr[] = new int[n];
            int sum = 0;
            for(int i = 0;i<n;i++)
            {
                arr[i] =  in.nextInt();
                sum += arr[i];
            }
            
            if(sum%2 == 1)
            {
                sb.append("0\n");
                continue;
            }
            int dp[][] = new int[n+1][sum/2+1];
            for(int i = 0;i<=n;i++)
            dp[i][0] = 1;
            
            for(int i = 1;i<=sum/2;i++)
            {
                for(int j = 1;j<=n;j++)
                {
                    dp[j][i] = dp[j-1][i];
                    if(i>=arr[j-1])
                    {
                        dp[j][i] = Math.max(dp[j][i],dp[j-1][i - arr[j-1]]);
                    }
                }
            }
            if(dp[n][sum/2] == 0){
            sb.append("0\n");
            continue;
            }
            boolean change = true;
            while(change)
            {
                for(int i = 0;i<n;i++)
                {
                    if(arr[i]%2 == 1)
                    {
                        sb.append("1\n");
                        sb.append((i+1)+"\n");
                        change = false;
                        break;
                    }
                    else 
                    arr[i]/=2;
                }
            }
            
                
        }
	    System.out.print(sb);
	}
	
    static int upper_bound(int arr[],int x){
	    int a=Arrays.binarySearch(arr,x);
	    if(a<0){
	        a*=(-1);
	    
	        return a-1; 
	    }
	    else{
	        
	        while(a<arr.length && arr[a]==x)
	           ++a;
	           return a;
	    }
	}
	static long gcd(long a ,long b)
	{
    if(a==0)
    return b;
    else return gcd(b%a,a);
    }
    
//------making a Fendwick tree ---//
	// creating a fendwick tree
	static long ftree[];
	static void buildFendwicktree(int arr[],int n)
	{
		ftree=new long[n+1];
		for(int i=0;i<n;i++)
			upftree(arr[i],i,n);
	}
	static void upftree(int value,int n,int i)
	{
		int index=i+1;
		while(index<=n)
		{
		  ftree[index]+=value;
		  index+=(index&(-index));  // adding last bit to the index 
		}
	}
	static long getSum(int index)
	{
		long sum=0;
		index+=1;
		while(index>0)
		{
			sum+=ftree[index];
			index-=(index&(-index)); // fliping last index of the tree; 
		}
		return sum;
	}
//------Fendwick tree ends ---------//
}


class sgmtree{
    int arr[];
    sgmtree(int input[],int n){
        arr=new int[100001];
        buildtree(input,1,0,n-1);
    }
    void buildtree(int input[],int si,int ss,int se){
        if(ss==se){
         arr[si]=input[ss];
         return;
        }
         int mid=(ss+se)/2;
         buildtree(input,2*si,ss,mid);
         buildtree(input,2*si+1,mid+1,se);
         arr[si]=Math.min(arr[2*si],arr[2*si+1]);
         
    }
    int query(int si,int ss,int se,int qs,int qe){
        if(qs>se  || qe<ss)
         return Integer.MAX_VALUE;
        
        if(ss>=qs && qe>=se)
        return arr[si];
        
        int mid=(ss+se)/2;
        int l=query(2*si,ss,mid,qs,qe);
        int r=query(2*si+1,mid+1,se,qs,qe);
        return Math.min(l,r);
    }
    void update(int input[],int index,int value){
        input[index]=value;
        updateutils(input,1,0,input.length-1,index);
    }
    void updateutils(int input[],int si,int ss,int se,int qi){
        if(ss==se){
            arr[si]=input[ss];
            return;
        }
        int mid=(ss+se)/2;
        if(qi<=mid)
        updateutils(input,2*si,ss,mid,qi);
        else
        updateutils(input,2*si+1,mid+1,se,qi);
        arr[si]=Math.min(arr[2*si],arr[2*si+1]);
    }
    
}
	
	/* This is for sorting first accorting to gain[1] if gain[1] is same the gain[0]
Arrays.sort(gain, (long[] l1, long[] l2) -> {
	        if(l1[1] != l2[1])return Long.compare(l2[1], l1[1]);//Sorting in non-increasing order of gain
	        return Long.compare(l1[0], l2[0]);//Choosing smallest bit among all bits having same gain
	    });
*/

class pair{
    int x,y;
    pair(int x,int y){
        this.x=x;
        this.y=y;
    }
}	
class CompareValue { 
  
    static void compare(pair arr[], int n) 
    { 
        Arrays.sort(arr, new Comparator<pair>() { 
        public int compare(pair p1, pair p2) 
            { 
                return p1.y - p2.y; 
            } 
        }); 
    } 
}
class CompareKey{
    static void compare(pair arr[],int n){
        Arrays.sort(arr,new Comparator<pair>(){
            public int compare(pair p1,pair p2)
            {
                return p2.x-p1.x;
            }
        });
    }
}
class FastReader {

    byte[] buf = new byte[2048];
    int index, total;
    InputStream in;

    FastReader(InputStream is) {
        in = is;
    }

    int scan() throws IOException {
        if (index >= total) {
            index = 0;
            total = in.read(buf);
            if (total <= 0) {
                return -1;
            }
        }
        return buf[index++];
    }

    String next() throws IOException {
        int c;
        for (c = scan(); c <= 32; c = scan()) ;
        StringBuilder sb = new StringBuilder();
        for (; c > 32; c = scan()) {
            sb.append((char) c);
        }
        return sb.toString();
    }

    String nextLine() throws IOException {
        int c;
        for (c = scan(); c <= 32; c = scan()) ;
        StringBuilder sb = new StringBuilder();
        for (; c != 10 && c != 13; c = scan()) {
            sb.append((char) c);
        }
        return sb.toString();
    }

    char nextChar() throws IOException {
        int c;
        for (c = scan(); c <= 32; c = scan()) ;
        return (char) c;
    }

    int nextInt() throws IOException {
        int c, val = 0;
        for (c = scan(); c <= 32; c = scan()) ;
        boolean neg = c == '-';
        if (c == '-' || c == '+') {
            c = scan();
        }
        for (; c >= '0' && c <= '9'; c = scan()) {
            val = (val << 3) + (val << 1) + (c & 15);
        }
        return neg ? -val : val;
    }

    long nextLong() throws IOException {
        int c;
        long val = 0;
        for (c = scan(); c <= 32; c = scan()) ;
        boolean neg = c == '-';
        if (c == '-' || c == '+') {
            c = scan();
        }
        for (; c >= '0' && c <= '9'; c = scan()) {
            val = (val << 3) + (val << 1) + (c & 15);
        }
        return neg ? -val : val;
    }
}